This article compares the relevant records of “Suishu․ShiWei” with the later history books “Beishi” “Tongdian” “Tanghuiyao” “Taipinghuanyuji” “Cefuyuangui” “Xintangshu” “Tongzhi” “Wenxiantongkao”. This proves that the “Suishu․ShiWei” is the earliest and most comprehensive record for ShiWei of Sui dynasty. It is the main sourse for the later Historical documents and the most valuable and fundamental for studying ShiWei of Sui Dynasty.